Inking mechanism for printing-press cylinders



1 H. A. w. wooD 30,711

INKING MECHANISM FOR PRINTING PRESS CYLINDERS Orig inal Filed April 6, 192a 7 2' are 04 tudinally of their axis.

l at ented Oct. 8, 1929 uurrso STATES igsani rear v HENRY A. WISE woon, or NEW YORK, 1v. Y.,I'Ass1oNoia-7ro woon; nnwsrnrnit MA- CHINERY oon'rone'rron, or new Yonx, N. Y., A conrona r on or VIRGINIA INKING MECIIAIIIST/I FOR PRINTING-PRESS CYLINDERS Application filed April e, 1926, Serial no. o oae. Renewed rial-(iii 5, 1352s.:

This invention relates to the inking of printing cylinders; The principal object of the invention is to provide means whereby the so-called ghosts sometimes appearing in grinting will be eliminated or reduced.

ther objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which i Fig. l is an end view of half a printing press showing one form of this invention applied thereto; and

F 2 is a plan of the operating mecha nism for the parts to which this invention relates,

As printing presses have been built heretofore, several of the rollers which bear against the ink drum are caused to vibrate, but the form rollers which transfer the ink from the ink drum to the plate cylinder have their bearings fixed in stationary position. The result of this was that, where a particu larly heavy cut is followed by a light printing surface, so-called ghosts appear in the printing. The object of this invention is to obviate or reduce this defect.

I have shown the invention as applied to an ordinary printing press comprising inking mechanism 10, ink 'drum 11, vibrating rolls 12 for spreading the ink on the ink drum, and two form rolls 13 for transferring the ink from the ink drum to the plate cylinder 14. I do not change the vibrating rolls 12. They may be vibrated in any ordinary way and it is immaterial to this invention whether they all vibrate or part of them.

For the purpose of eliminating the irregularities in the ink on the plate cylinders so that such irregularities will be disbursed and not be repeated, even in small degree on the subsequent revolution, I provide the form rolls 13 with means for vibrating them longi- The result of this is that if a heavy out has been printed and followed by a light print, the film of ink on the plate cylinder, which is thus made irregular, will be spread out by the two vibrating form rolls before the next printing operation. Thus no resultof the varying amount of ink taken off the plate cylinder in the previous revolution will appear in the next impression made. i r

An ordinary vibrating means can be employed for accomplishing: this result such as a worm 20 on the ink drum shaft 1 9 operating a worm wheel 21 on a vertical shaft 22. On this shaft is an eccentric pin 23 which turns in a slot on a lever 24 and vibrates that lever i on its axis 25.v This lever has pins 26at its ends which engage in grooved collars 27- on the shafts 28 of the form rolls 13. The result of this motion is to vibrate the form rolls and push one forwardwhen the other is pulled back. Thus each roll is vibrated first in one direction and thenin'the opposite direction, the two being vibratedsimultaneously. v Now if an impression causes a thin spot followed by a thick spot in the ink film on the plate cylinder tocome around; into contact with these form rolls,that irregularity in the old construction"; would be merely spread out a little and would sometimes appear on the next impression. In this case it has to pass each form roll and while it is passing it, that form roll is moving endwise, so that this irregularity in the ink film is distributed endwise as well as circumferentially: If

there is anything left of that spot after passing one form roll, the action is repeated when it passes the next, which may be moving longitudinally. Even when the irregular spot passes one form roll while the same is at one end of its stroke and, therefore, not

moving to any great extent, it will be likely to be entirely spread out by the other when it reaches it. In other words, the section of the roll exposed to the heavy cut during some n of the revolution of the plate cylinder is all the details of construction herein shown and described, but what I do claim is 1. In an inking mechanism for a printing press, the combination of an ink drum, vibrating rolls in contact therewith, form rolls for transmitting a film of ink from the drum to the plate cylinder, and means for vibrating said form rolls simultaneously in opposite directions.

2. In an-inking mechanism f r a printing press the com na ion. of an ink rum f an ink drum carried thereby, vibrating rolls in contact with said ink drum, form roll shafts, a form roll on each of said shafts for transmitting a film of ink from the drum to the plate cylinder, and means for vibrating said form rolls said means comprising gear and lever connections between the inking drum s a a d t e form r011 Shaf In a n ng m ha ism. er a P intin P F S the e e iee ie o a nk d um haf 1 drum arried. t y, ib a i ro in contact with said ink drum, form roll shafts, a form'roll on each of said shafts for transmitting a film of ink from the drum to the plate'cylinder, and means for vibrating said form rolls, said means comprising a gear mounted on the ink drum shaft, 'a worm wheel in mesh therewith, the shaft of the worm wheel carrying an eccentrically mounted pin, a vibrating lever provided with a fluid in'which said pin operates, a grooved collar on each form roll shaft and pins on opposite ends of said lever engaging in the groove in said collars.

In testimony whereof I have hereunto affixed my signature.

' HENRY A. WISE WOOD. 

